Simplify code to always use the cfg->uris array.
Fix warning.
Fix stat Options subsection.
Don't attempt multiple free's in the case of an error, free by the same
name in the common/error case, it's less confusing.
Add a WT_SESSION_IMPL structure that allows us to store memory and free
it once no transaction can still be using it.
Merge branch 'develop' into new-split